Ash disposal screw



1950 w. M. SCHWEICKART ET AL 2,533,329

ASH DISPOSAL SCREW Filed Oct. 2, 1944 2 Sheets-Shae? 1 J m we 11% 62 W/!. L IAM M. SCHWE/CAAET 0 FRED G. JULYA/V Dec, 12, 1950 w. M. SCHWEICKART ET AL 2,533,329

ASH DISPOSAL SCREW 2 Sheets-Sheet 2 Filed 00%. 2-, 1944 I 1145 0 o 3 mwwa Patented Dec. l2, 1950 ASH DISPOSAL SCREW William Schweichart, Bay Village, and Fred G. Julyan, Euclid, Ohio, assignors, by mesne assignments, to Iron Fireman Manufacturing Company, lortland, reg., a corporation 0f Gregor:

Application October 2, 1944, Serial No. 556,686

2 Claims.

This invention relates to improvements in au tomatic coal burners.

The object of the invention is to provide an economical and effective ash disposal receiving the ashes from the ash ring discharge and delivering them into adjacently placed ash barrels.

Other objects and advantages of the invention will appea from the following description considered in connection with the accompanying drawings'in which Fig. l is a perspective view of the stoker with the bin collector omitted;

Fig. 2 is a central section through the ash elevator in a plane parallel to the ash removal screw with the discharge head rotated to show the discharge spouts; and

Fig. 3 is a fragmentary section of the base of the ash elevator structure on line 3-3 of Fig. 2.

The specific embodiment shown in Fig. 1 comprises a drive unit B, a burner unit C and an ash discharge unit D.

A coal collector unit, not shown, is positioned in the coal bin and supplies coal to the coal feed tube 22 in which is positioned the coal screw 2i, with the collector unit driven from the coal feed screw 2!. A suitable collector unit is shown and described in our Patent No. 2,233,085.

Where the conveyor tube 22 requires a bend, this is preferably made as an angle, for instance, a right angle, through afeed knuckle (not shown) provided for conveying the coal around the angle.

The drive unit 13. includes the motor with its controls, the blower and air supply, the drive for the coal feed and ash discharge screws, the grate rotor drive and gas withdrawal construction.

The drive assembly is mounted on a base 12 provided with a longitudinal cylindrical passage for the coal to which sections of the coal feed tube 22 are connected and through which the last section of the coal feed screw 2! passes. The

base '52 above the feed end of coal passage 13 carries a cradle supporting motor F5. The motor 75 is bolted to the reduction gear casing 36, which in turn is supported from a bracket of the base 12. The rear end of motor shaft carries the rotor of blower 38. A suitable muffler is preferably provided comprising a housing surrounding the blower air inlet and extending to the right in the form of a rectangular closed compartment projecting beyond blower casing sufiiciently to accommodate the larger air inlet tube 82. The air inlet tube 82 provides a definite column of air whose vibration period may be varied by altering the length of tube 82 until the inlet air noise is reduced to a minimum.

The various conveying mechanisms are driven by motor 15 through a drive shaft suitably connected to the coal feed screw 2|, and to the 'ash removal apparatus.

This apparatus includes an ash removal shaft 89 journaled in the base l2 and the coal feed screw 2l and the ash removal shaft 89 both extend to the burner unit C. In the form illustrated herein, the ash removal shaft 89 is provided with a sprocket connected by a chain with another sprocket on a drive shaft from the motor. A

- handle Ida at the left of the unit is mounted on a clutch release armto control the connection to the drive shaft.

The burner unit 0 includes a rotating grate structure 189 which surrounds-an inner retort of the burner unit C of the type in which the coal i forced upwardly through the bottom of the burner retort or pot structure, burning in the upper portion thereof and traveling over the edge onto the grate structure through which the ashes pass.

An ash trough 299 extends around and below the ash table segments for the direct discharge of ashes from the ash table. The ashes carried around the ash table are continuously discharged by a simple scraper arrangement and a suitable arrangement is provided for automatically removing the ashes from the burner unit C and discharging them at an appropriate point, the construction preferably including an ash removal conveyor and an elevator for transferring the ashes from the conveyor to a suitable discharge point. In the form illustrated the ashes are removed from the ash discharge chamber by ash removal tube 285 mounted in the burner body. Tube 285 extends to an appropriate point and is shown as terminating adjacent drive unit B (Fig. 1) At this point a suitable elevator unit 33 is positioned to receive the ashes. A convenient construction is disclosed, employing an arrangement in which the ash removal tube 285 termihates in an elevator pocket 28'! (Figs. 2 and 3) formed in elevator base 288. Ash removal screw 2l8 terminates at the pocket while the shaft 89 on which the screw is mounted extends through the pocket and a suitable bearing 289 at the opposite side of the elevator base 288, and thenceto the drive mechanism as already set forth.

An elevator tube 290 is mounted in elevator base 288 extending from pocket 28! upwardly in any desired direction to permit discharge at any appropriate point dictated by local conditions, the angle of tube 290 being readily adjusted by clamping base 288 in any desired rotated position about ash removal tube 285 through clamping screw 29L An elevator screw 292 is positioned in tube 298 to pick up ashes discharged into pocket 28'! and raise them in tube 290 to a discharge at the upper end of the tube. Various methods of mounting and driving screw 292 may be employed, and preferably are arranged to permit accessibility and removal of screw 282 without dismantling the supporting and driving arrangement. In the form illustrated, the screw 292 is driven from a bevel gear 293 on shaft 89 driving bevel gear 294 mounted on elevator base 288 and carrying sprocket 295 which through sprocket chain 298 drives sprocket 297 on elevator shaft 298 mounted in thrust bearing 299 in the elevator base 288.

Means may be provided for protecting the lower end of the shaft 298 from the ashes in pocket 287, as by protector sleeve 388 mounted in fixed position on base 288 surrounding elevator shaft 298, and serving as a guide and support for the tubular elevator screw 292 rotatable around sleeve 380. Screw 292 is suitably attached to shaft 288 above sleeve 380, as by pins 381 and spacer rings 302.

Sleeve 300 is maintained in proper spaced relation to shaft 298 and screw 292 by suitable bushings such as the leaded bronze bushings 282 between the upper end of sleeve 388 and shaft 298, and leaded bronze bushing 283 between the lower end of screw 292 and tube 300. A suitable sealing bearing is provided between the lower end of screw 292 and the base 288 and comprises a leaded bronze thrust washer 385 and a suitable resilient backing such as rubber rings 386 surrounding shaft 298.

To aline the bearings at the ends of shaft 298, a suitable self-alining joint is provided, such as that illustrated in Fig. 2, in which the lower section of shaft 298 is provided with a tongue 383 held in a corresponding slot 308 in the upper section by pin 385, the construction being arranged to permit the very slight play necessary to assure smooth running in the bearings. Screw 292 will of course be broken at the flexible connection as shown.

A suitable discharge arrangement is provided at the upper end of elevator tube 298. This may comprise a discharge head 306 mounted on the upper end of elevator tube 290 and carrying an upper bearing 38? for the elevator shaft 298. Head 306 is provided with suitable spout discharge means, the illustrated construction employing two discharge spouts 388 and 389, each of which may be provided with a flexible tube 310 clamped thereto for directing the ashes to any suitable receptacle, such as ash can 3| I (Fig. 1). A suitable hinged door 3I2 may be provided opposite spouts 388 and 389 to permit access to the mechanism and to serve as an overflow outlet for ashes when the spouts 308 and 309 are filled or obstructed.

This application is a division of our application Serial No. 383,432 (now Patent No. 2,359,445), which is a division of our original application 4 Serial No. 161,494, filed August 28, 1937 (now Patent No. 2,306,189).

We claim:

1. In a stoker the combination with a motor drive, of a first worm feed comprising a conveyor tube containing a first worm driven from said motor drive and adapted to receive a supply of material at one end and deliver it at its other end, a second worm feed extending at an angle to said first worm feed and comprising a conveyor tube and a hollow worm therein having a material receiving end adjacent said delivery end of said first feed worm, a housing adjustable to various settings around the axis of said first conveyor tube and connected thereto, means on said housing supporting said second conveyor tube, a drive shaft in said hollow worm connected thereto and having a supporting bearing in said housing adjacent said receiving end of said second worm, and means for driving said drive shaft from said main worm comprising rotary means carried by said housing and connected to said drive shaft adjacent said supporting bearing in all adjusted positions of said housing.

2. A stoker feed apparatus as set forth in claim 1 in which the hollow worm and its drive shaft are in sections connected by a pivot joint between the separate sections of said shaft and worm.

WILLIAM M. SCHWEICKART. FRED G. JULYAN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date Re. 18,006 Hall Mar. 24, 1931 1,139,708 Niedergasaess May 18, 1915 1,421,994 Rohrer July 4, 1922 1,565,018 Lower Dec. 8, 1925 1,644,489 Pitman Oct. 4, 1927 1,809,903 Lower June 16, 1931 1,920,912 Ousdahl Aug. 1, 1933 1,933,656 Carter et al. Nov. 7, 1933 1,946,850 Goss et a1 Feb. 3, 1934 1,953,021 Lower Mar. 27, 1934 2,039,389 Buskard May 5, 1936 2,045,757 Constantin June 30, 1936 2,094,093 Carter Sept. 28, 1937 2,100,937 Bowe Nov. 7, 1937 2,122,807 Carter July 5, 1938 2,171,958 Zehrback Sept. 5, 1939 2,176,563 Schwitzer et al. Oct. 17, 1939 2,182,093 Peltz Dec. 5, 1939 2,191,219 Peltz Feb. 20, 1940 2,231,987 Carter Feb. 18, 1941 2,240,972 Winkler et al. May 6, 1941 2,243,970 Lower June 3, 1941 2,248,206 Suman July 8, 1941 2,260,824 Bliss et al Oct. 28, 1941 2,321,389 Julyan et al June 8, 1943 2,359,638 Gregor Oct. 3, 1944 

